Sudoku #x697

Sudoku game, level: Expert #697. This Sudoku have 28 given numbers (clues)..
Structure: 3 (2 pcs.), 7 (2 pcs.), 6 (3 pcs.), 4 (3 pcs.), 2 (3 pcs.), 8 (3 pcs.), 9 (4 pcs.), 5 (4 pcs.), 1 (4 pcs.), ∑28.


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